fenced code blocks in comments are not ignored if they contain an unpaired backtick

[lopopolo]

Describe the bug

If a comment contains a fenced code block (one that starts with three backticks), that code block is usually ignored.

When the code block contains a single unpaired backtick, the block is spellchecked.

To Reproduce

Steps to reproduce the behaviour:

1. A file containing:

   // From `spec/core/symbol/inspect_spec.rb`:
   //
   // ```ruby
   // symbols = {
   //   fred:         ":fred",
   //   :fred?     => ":fred?",
   //   :fred!     => ":fred!",
   //   :$ruby     => ":$ruby",
   //   :@ruby     => ":@ruby",
   //   :@@ruby    => ":@@ruby",
   //   :"$ruby!"  => ":\"$ruby!\"",
   //   :"$ruby?"  => ":\"$ruby?\"",
   //   :"@ruby!"  => ":\"@ruby!\"",
   //   :"@ruby?"  => ":\"@ruby?\"",
   //   :"@@ruby!" => ":\"@@ruby!\"",
   //   :"@@ruby?" => ":\"@@ruby?\"",
   //
   //   :$-w       => ":$-w",
   //   :"$-ww"    => ":\"$-ww\"",
   //   :"$+"      => ":$+",
   //   :"$~"      => ":$~",
   //   :"$:"      => ":$:",
   //   :"$?"      => ":$?",
   //   :"$<"      => ":$<",
   //   :"$_"      => ":$_",
   //   :"$/"      => ":$/",
   //   :"$'"      => ":$'",
   //   :"$\""     => ":$\"",
   //   :"$$"      => ":$$",
   //   :"$."      => ":$.",
   //   :"$,"      => ":$,",
   //   :"$`"      => ":$`",
   //   :"$!"      => ":$!",
   //   :"$;"      => ":$;",
   //   :"$\\"     => ":$\\",
   //   :"$="      => ":$=",
   //   :"$*"      => ":$*",
   //   :"$>"      => ":$>",
   //   :"$&"      => ":$&",
   //   :"$@"      => ":$@",
   //   :"$1234"   => ":$1234",
   //
   //   :-@        => ":-@",
   //   :+@        => ":+@",
   //   :%         => ":%",
   //   :&         => ":&",
   //   :*         => ":*",
   //   :**        => ":**",
   //   :"/"       => ":/",     # lhs quoted for emacs happiness
   //   :<         => ":<",
   //   :<=        => ":<=",
   //   :<=>       => ":<=>",
   //   :==        => ":==",
   //   :===       => ":===",
   //   :=~        => ":=~",
   //   :>         => ":>",
   //   :>=        => ":>=",
   //   :>>        => ":>>",
   //   :[]        => ":[]",
   //   :[]=       => ":[]=",
   //   :"\<\<"    => ":\<\<",
   //   :^         => ":^",
   //   :"`"       => ":`",     # for emacs, and justice!
   //   :~         => ":~",
   //   :|         => ":|",
   //
   //   :"!"       => [":\"!\"",  ":!" ],
   //   :"!="      => [":\"!=\"", ":!="],
   //   :"!~"      => [":\"!~\"", ":!~"],
   //   :"\$"      => ":\"$\"", # for justice!
   //   :"&&"      => ":\"&&\"",
   //   :"'"       => ":\"\'\"",
   //   :","       => ":\",\"",
   //   :"."       => ":\".\"",
   //   :".."      => ":\"..\"",
   //   :"..."     => ":\"...\"",
   //   :":"       => ":\":\"",
   //   :"::"      => ":\"::\"",
   //   :";"       => ":\";\"",
   //   :"="       => ":\"=\"",
   //   :"=>"      => ":\"=>\"",
   //   :"\?"      => ":\"?\"", # rawr!
   //   :"@"       => ":\"@\"",
   //   :"||"      => ":\"||\"",
   //   :"|||"     => ":\"|||\"",
   //   :"++"      => ":\"++\"",
   //
   //   :"\""      => ":\"\\\"\"",
   //   :"\"\""    => ":\"\\\"\\\"\"",
   //
   //   :"9"       => ":\"9\"",
   //   :"foo bar" => ":\"foo bar\"",
   //   :"*foo"    => ":\"*foo\"",
   //   :"foo "    => ":\"foo \"",
   //   :" foo"    => ":\" foo\"",
   //   :" "       => ":\" \"",
   // }
   // ```

2. Run cargo spellcheck edit

3. Observe these spelling errors:

   error: spellcheck(Hunspell)
     --> /Users/lopopolo/dev/artichoke/artichoke/spinoso-symbol/src/inspect.rs:796
      |
   796 |    :"/"       => ":/",     # lhs quoted for emacs happiness
      |                              ^^^
   
   (122/284) Apply this suggestion [y,n,q,a,d,j,e,?]?
   
    laths
    lbs
    ohs
   » ls
    `lhs`
    ...
   error: spellcheck(Hunspell)
     --> /Users/lopopolo/dev/artichoke/artichoke/spinoso-symbol/src/inspect.rs:796
      |
   796 |    :"/"       => ":/",     # lhs quoted for emacs happiness
      |                                             ^^^^^
   
   (123/284) Apply this suggestion [y,n,q,a,d,j,e,?]?
   
    emaciates
    e macs
    maces
    macs
   » Emacs
    `emacs`
    ...
   error: spellcheck(Hunspell)
     --> /Users/lopopolo/dev/artichoke/artichoke/spinoso-symbol/src/inspect.rs:810
      |
   810 |    :"`"       => ":`",     # for emacs, and justice!
      |                                  ^^^^^
   
   (194/284) Apply this suggestion [y,n,q,a,d,j,e,?]?
   
    emaciates
    e macs
    maces
    macs
   » Emacs
    `emacs`
    ...
   error: spellcheck(Hunspell)
     --> /Users/lopopolo/dev/artichoke/artichoke/spinoso-symbol/src/inspect.rs:829
      |
   829 |    :"\?"      => ":\"?\"", # rawr!
      |                              ^^^^
   
   (249/284) Apply this suggestion [y,n,q,a,d,j,e,?]?
   
    raw r
    rawer
   » raw
    `rawr`
    ...

Expected behavior

Screenshots

Please complete the following information:

• System: macOS
• Obtained: cargo install
• Version: cargo-spellcheck 0.11.0

Additional context

[lopopolo]

Now that I've also filed https://github.com/drahnr/cargo-spellcheck/issues/257, I'm not sure if these two issues are the same because the sample snippet includes empty lines in the fenced code block comment.

[drahnr]

Hey @lopopolo , thanks for reporting this and #257 , I very much appreciate it!

Indeed, this seems to be duplicate of #257 .